It seems discourse support mapping an email to category. I can't confirm if it will work only for user registered on our discourse platform. In any case if we create such email, I suspect that most user using such email would not expect to have their message publicly posted. So at this stage my recommendation would be for the IT department to create an discourse account and reach out like any other user via this forum (or even comment on this conversation).
I understand this is not the expected answer. This is something we can discuss as part of the conversation: Misunderstood requirements preventing the use of OpenRefine in my organization.